Last year, the city of Riverdale replaced all standard streetlights in its downtown commercial district with much brighter LED lights in an effort to reduce nighttime pedestrian trip-and-fall accidents. However, hospital records indicate that the number of pedestrians treated for injuries resulting from nighttime trip-and-fall accidents in that district increased significantly over the following year.
Which of the following, if true, most helps to resolve the apparent discrepancy described above?
- AThe installation of the LED streetlights was completed ahead of schedule and cost significantly less than the city council had initially budgeted.
- BThe new LED fixtures illuminate uneven curbs and sidewalk cracks much more clearly than the standard fixtures did.
- The improved lighting made the downtown commercial district feel safer at night, leading to a substantial increase in the total number of pedestrians walking there after dark.Cevap
- DThe city failed to replace the light fixtures along three peripheral alleyways within the commercial district.
- ENighttime pedestrian trip-and-fall accidents always occur more frequently during winter months than during summer months.
Cevap
The statement that the improved lighting made the downtown district feel safer at night, leading to a substantial increase in the total number of pedestrians walking there after dark.
The correct response resolves the paradox by demonstrating an increase in the total exposed population. If brighter lights attracted a significantly larger volume of pedestrians downtown after dark, the total number of injuries could rise simply because far more people were walking there, even if the likelihood of any single pedestrian falling was reduced.
Adım Adım Çözüm
Anahtar Kavram
Distinguishing between absolute totals and per-capita rates to reconcile unexpected trends
Tahmini Süre:50s